QUESTION 14
Seven saturated compounds, all with 4 Carbon atoms and one oxygen, have the following boiling
points:
Compound 1:34.6 C
Compound 4: 83°C
Compound 2: 117.7°C
Compound 5:39 0
Compound 3: 99°C
Compound 6: 30.75°C
Compound 7: 107.89 C
From this data; it could be that:
[A] Compounds 1,5 are 6 aldehydes, and Compounds 2, 3, 4 and 7 alcohols.
[B] Compounds 1, 5 and 6 esters are, and Compounds 2, 3, 4 and 7 carboxylic acids.
[C] One cannot deduce any functional group from physical properties.
[D] Compounds 1, 5 and 6 are ethers, and Compounds 2, 3, 4 and 7 alcohols.

Within each functional group, the boiling points of members of the group vary according to molecular weight. Therefore, one cannot deduce any functional group from boiling points.

Organic compounds are divided into families called homologous series. Each homologous series has a functional group common to all the members of the series. As a result of this, the chemical properties of all the members of the homologous series are similar.

However, the boiling points of the members of a homologous series vary according the their molecular weights. As such, boiling points can not be used as evidence to classify substances into any particular homologous series.

Summarily, one cannot deduce any functional group from physical properties.

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